Deep Turbulence Effects Mitigation with Coherent Combining of 21 Laser Beams Over 7 km
We demonstrate coherent beam combining and adaptive mitigation of atmospheric turbulence effects over 7 km under strong scintillation conditions using a coherent fiber array laser transmitter operating in a target-in-the-loop setting. The transmitter system is composed of a densely packed array of 21 fiber collimators with integrated capabilities for piston, tip, and tilt control of the outgoing beams wavefront phases. A small cat’s-eye retro reflector was used for evaluation of beam combining and turbulence compensation performance at the target plane, and to provide the feedback signal for control of piston and tip/tilt phases of the transmitted beams using the stochastic parallel gradient descent maximization of the power-in-the-bucket metric.
Copyright © 2016, Optical Society of America
Optical Society of America
Weyrauch, Thomas; Vorontsov, Mikhail; Mangano, Joseph; Ovchinnikov, Vladimir; Bricker, David; Polnau, Ernst; and Rostov, Andrey, "Deep Turbulence Effects Mitigation with Coherent Combining of 21 Laser Beams Over 7 km" (2016). Electro-Optics and Photonics Faculty Publications. 85.